This work demonstrates for the first time the implementation of a level-crossing analog-to-digital converter (LC-ADC)in a single, commercially available IC (that costs less than $2). The implementation utilizes adaptive threshold levelsin order to prevent overload distortions for fast-changing signals. The entire design is based on a 20-pin PIC16F1769microcontroller from Microchip and no external components are required. In fact, the only external circuitry required is asingle jumper wire. This is due to the fact that the new generation of microcontrollers have integrated core-independenthardware, analog as well as digital. This design takes full advantage of the core-independent logic and analog blocksin a PIC16F17xx circuit to implement the LC-ADC technique that so far has required multiple-circuit designs or ASICimplementation. The design is demonstrated on a standard electrocardiogram (ECG) signal.
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